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Just a little secret glitch you can do with snap chat which you can freak out Your friends or have them confused lol . When you take a picture type this Negative... And your photo will have a negative effect and also put this B&w... And it will be black and white. And for android user you can also do this one Sepia...
This works for both idevices and android users.
Don't know if this was posted or not but enjoy